Preface.- Better science through predictive modeling: Numerical tools for understanding neuromechanical interactions.- A neuromechanical model of spinal control of locomotion.- Neural regulation of limb mechanics: Insights from the organization of proprioceptive circuits.- Model-based approaches to understanding musculoskeletal filtering of neural signals.- Modeling the organization of spinal cord neural circuits controlling two-joint muscles.- Muscles: non-linear transformers of motor neuron activity.- Why is neuromechanical modeling of balance and locomotion so hard?.- Neuromusculoskeletal modeling for the adaptive control of posture during locomotion.- Model-based interpretations of experimental data related to the control of balance during stance and gait in humans.- Computing motion dependent afferent activity during cat locomotion using a forward dynamics musculoskeletal model.- Modeling and optimality analysis of pectoral fin locomotion.- Control of cat walking and paw-shakeby a multifunctional central pattern generator.